const { src, dest, parallel, series, watch } = require('gulp');
const loadPlugins = require('gulp-load-plugins');
const { sass, babel, swig, imagemin } = loadPlugins();

const plugins = loadPlugins();

const del = require('del');
const browserSync = require('browser-sync');

const bs = browserSync.create();

const data = {
  menus: [
      {
          name: 'Home',
          icon: 'aperture',
          link: 'index.html'
      },
      {
          name: 'Features',
          link: 'features.html'
      },
      {
          name: 'About',
          link: 'about.html'
      },
      {
          name: 'Contact',
          link: '#',
          children: [
              {
                  name: 'Twitter',
                  link: 'https://twitter.com/w_zce'
              },
              {
                  name: 'About',
                  link: 'https://weibo.com/zceme'
              },
              {
                  name: 'divider'
              },
              {
                  name: 'About',
                  link: 'https://github.com/zce'
              }
          ]
      }
  ],
  pkg: require('./package.json'),
  date: new Date()
}

const clean = () => {
  return del(['dist']);
}

const style = () => {
  return src('src/assets/styles/*.scss', { base: 'src' })
    .pipe(sass({ outputStyle: 'expanded' }))
    .pipe(dest('temp'))
    .pipe(bs.reload({stream: true}))
}

const scripts = () => {
  return src('src/assets/scripts/*.js', { base: 'src' })
    .pipe(babel({ presets: ['@babel/preset-env'] }))
    .pipe(dest('temp'))
    .pipe(bs.reload({stream: true}))
}

const page = () => {
  return src('src/**/*.html', { base: 'src' })
    .pipe(swig({ data }))
    .pipe(dest('temp'))
    .pipe(bs.reload({stream: true}))
}

const image = () => {
  return src('src/assets/images/**', { base: 'src' })
    .pipe(imagemin())
    .pipe(dest('dist'));
}

const font = () => {
  return src('src/assets/fonts/**', { base: 'src' })
    .pipe(imagemin())
    .pipe(dest('dist'));
}

const extra = () => {
  return src('public/**', { base: 'public' })
    .pipe(dest('dist'));
}

const serve = () => {

  watch('src/assets/styles/*.scss', style);
  watch('src/assets/scripts/*.js', scripts);
  watch('src/**/*.html', page);


   // 在开发阶段 为减少性能的消耗 image等资源文件不执行编译或拷贝
    // watch('src/assets/images/**', image);
    // watch('src/assets/fonts/**', font);
    // watch('public/**', extra);

  watch([
    'src/assets/images/**',
    'src/assets/fonts/**',
    'public/**'
  ],bs.reload)
  
  bs.init({
    notify: false,
    port: 2080,
    // open: false,
    // files:'dist/**',
    server: {
      // baseDir: 'dist',
      baseDir:['temp','src','public'],
      routes: {
        '/node_modules':'node_modules'
      }
    }
  })
}


const useref = () => {
  return src('temp/*.html', { base: 'temp' })
    .pipe(plugins.useref({ searchPath: ['temp', '.'] }))
    .pipe(plugins.if(/\.js$/, plugins.uglify()))
    .pipe(plugins.if(/\.css$/, plugins.cleanCss()))
    .pipe(plugins.if(/\.html$/, plugins.htmlmin({
      collapseWhitespace: true,
      minifyCSS: true,
      minifyJS: true
    })))
    .pipe(dest('dist'))
}


const compile = parallel(style, scripts, page);

const build = series(clean, parallel(series(compile, useref), image, font, extra));

const develop = series(compile, serve);

module.exports = {
  compile,
  build,
  clean,
  develop,
  useref,
}